Research Article
Landslide Susceptibility Mapping in Darjeeling Himalayas, India
Table 2
Weights and ratings for various factors and their classes.
| Factors | Classes | Weights | Ratings |
| Drainage buffer | 1st order | 10 | 9 | 2nd order | 5 |
| Lineament buffer | 0–125 m | 9 | 9 | 125–250 m | 7 | 250–375 m | 5 | 375–500 m | 3 | >500 m | 1 |
| Slope | 0°–15° | 8 | 1 | 15°–25° | 3 | 25°–35° | 5 | 35°–45° | 7 | >45° | 9 |
| Rainfall | Moderate | 7 | 6 | High | 9 |
| Earthquake | Moderate | 7 | 6 | High | 9 |
| Lithology | Paro-subgroup (parogneiss) | 6 | 4 | Darjeeling gneiss | 6 | Gorubathan formation | 7 | Feldspathic greywacke | 2 | Graphite schist/gneiss | 7 | Quartzite key beds (paroquartzite) | 1 | Lingtse granite gneiss | 8 | Rangit pebble slate | 8 | Damuda formation | 4 | Geabdat sandstone | 3 | Chunabati formation | 6 | Quaternary and recent sediments | 9 | Composite of Rangit pebble slate and Damuda formation | 6 | Composite of Rangit pebble slate, Damuda formation, and Gorubathan formation | 7 | Composite of Damuda formation and Chunabati formation | 5 |
| Land use/land cover | Agriculture land | 5 | 5 | Barren land | 9 | Built-up area | 2 | Scrub land | 7 | Sparse forest | 6 | Tea plantation | 3 | Thick forest | 1 | Waterbody | 0 |
| Fault buffer | 0–125 m | 5 | 9 | 125–250 m | 7 | 250–375 m | 5 | 375–500 m | 3 | >500 m | 1 |
| Valley buffer | 0–100 m | 4 | 6 | >100 m | 0 |
| Soil | Fine loamy | 3 | 3 | Coarse loamy | 6 | Loamy skeletal | 9 |
| Relief | <1000 m | 3 | 3 | 1000–2000 m | 6 | >2000 m | 9 |
| Aspect | Flat | 1 | 0 | North | 1 | Northeast | 4 | East | 7 | Southeast | 8 | South | 9 | Southwest | 6 | West | 3 | Northwest | 2 |
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